--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/efs/dired-vir.el	Mon Aug 13 09:13:56 2007 +0200
@@ -0,0 +1,137 @@
+;;  -*-Emacs-Lisp-*-
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; File:          dired-vir.el
+;; Dired Version: $Revision: 1.1 $
+;; RCS:
+;; Description:   Virtual dired mode for browsing ls -lR listings.
+;; Author:        Sebastian Kremer <sk@thp.uni-koeln.de>
+;; Created:       7-Mar-1991 16:00
+;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;; Requirements and provisions
+(provide 'dired-vir)
+(require 'dired)
+
+(defun dired-virtual (dirname &optional switches)
+  "Put this buffer into Virtual Dired mode.
+
+In Virtual Dired mode, all commands that do not actually consult the
+filesystem will work.
+
+This is useful if you want to peruse and move around in an ls -lR
+output file, for example one you got from an ftp server.  With
+efs, you can even dired a directory containing an ls-lR file,
+visit that file and turn on virtual dired mode.  But don't try to save
+this file, as dired-virtual indents the listing and thus changes the
+buffer.
+
+If you have save a Dired buffer in a file you can use \\[dired-virtual] to
+resume it in a later session.
+
+Type \\<dired-mode-map>\\[revert-buffer] in the
+Virtual Dired buffer and answer `y' to convert the virtual to a real
+dired buffer again.  You don't have to do this, though: you can relist
+single subdirs using \\[dired-do-redisplay].
+"
+
+  ;; DIRNAME is the top level directory of the buffer.  It will become
+  ;; its `default-directory'.  If nil, the old value of
+  ;; default-directory is used.
+
+  ;; Optional SWITCHES are the ls switches to use.
+
+  ;; Shell wildcards will be used if there already is a `wildcard'
+  ;; line in the buffer (thus it is a saved Dired buffer), but there
+  ;; is no other way to get wildcards.  Insert a `wildcard' line by
+  ;; hand if you want them.
+
+  (interactive
+   (list (read-string "Virtual Dired directory: " (dired-virtual-guess-dir))))
+  (goto-char (point-min))
+  (or (looking-at "  ")
+      ;; if not already indented, do it now:
+      (indent-region (point-min) (point-max) 2))
+  (or dirname (setq dirname default-directory))
+  (setq dirname (expand-file-name (file-name-as-directory dirname)))
+  (setq default-directory dirname)	; contains no wildcards
+  (let ((wildcard (save-excursion
+		    (goto-char (point-min))
+		    (forward-line 1)
+		    (and (looking-at "^  wildcard ")
+			 (buffer-substring (match-end 0)
+					   (progn (end-of-line) (point)))))))
+  (if wildcard
+	(setq dirname (expand-file-name wildcard default-directory))))
+  ;; If raw ls listing (not a saved old dired buffer), give it a
+  ;; decent subdir headerline:
+  (goto-char (point-min))
+  (or (looking-at dired-subdir-regexp)
+      (dired-insert-headerline default-directory))
+  (dired-mode dirname (or switches dired-listing-switches))
+  (setq mode-name "Virtual Dired"
+	revert-buffer-function 'dired-virtual-revert)
+  (set (make-local-variable 'dired-subdir-alist) nil)
+  (dired-build-subdir-alist)
+  (goto-char (point-min))
+  (dired-initial-position dirname))
+
+(defun dired-virtual-guess-dir ()
+
+  ;; Guess and return appropriate working directory of this buffer,
+  ;; assumed to be in Dired or ls -lR format.
+  ;; The guess is based upon buffer contents.
+  ;; If nothing could be guessed, returns nil.
+
+  (let ((regexp "^\\(  \\)?\\([^ \n\r]*\\)\\(:\\)[\n\r]")
+	(subexpr 2))
+    (goto-char (point-min))
+    (cond ((looking-at regexp)
+	   ;; If a saved dired buffer, look to which dir and
+	   ;; perhaps wildcard it belongs:
+	   (let ((dir (buffer-substring (match-beginning subexpr)
+					(match-end subexpr))))
+	     (file-name-as-directory dir)))
+	  ;; Else no match for headerline found.  It's a raw ls listing.
+	  ;; In raw ls listings the directory does not have a headerline
+	  ;; try parent of first subdir, if any
+	  ((re-search-forward regexp nil t)
+	   (file-name-directory
+	    (directory-file-name
+	     (file-name-as-directory
+	      (buffer-substring (match-beginning subexpr)
+				(match-end subexpr))))))
+	  (t				; if all else fails
+	   nil))))
+
+
+(defun dired-virtual-revert (&optional arg noconfirm)
+  (if (not
+       (y-or-n-p "Cannot revert a Virtual Dired buffer - switch to Real Dired mode? "))
+      (error "Cannot revert a Virtual Dired buffer.")
+    (setq mode-name "Dired"
+	  revert-buffer-function 'dired-revert)
+    (revert-buffer)))
+
+;; A zero-arg version of dired-virtual.
+;; You need my modified version of set-auto-mode for the
+;; `buffer-contents-mode-alist'.
+;; Or you use infer-mode.el and infer-mode-alist, same syntax.
+(defun dired-virtual-mode ()
+  "Put current buffer into virtual dired mode (see `dired-virtual').
+Useful on `buffer-contents-mode-alist' (which see) with the regexp
+
+    \"^  \\(/[^ /]+\\)/?+:$\"
+
+to put saved dired buffers automatically into virtual dired mode.
+
+Also useful for `auto-mode-alist' (which see) like this:
+
+  \(setq auto-mode-alist (cons '(\"[^/]\\.dired$\" . dired-virtual-mode)
+			      auto-mode-alist)\)
+"
+  (interactive)
+  (dired-virtual (dired-virtual-guess-dir)))
+
+;;; end of dired-vir.el